
/* Copyright (c) 2007, Tobias Wolf <twolf@access.unizh.ch>
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * - Redistributions of source code must retain the above copyright notice, this
 *   list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright notice,
 *   this list of conditions and the following disclaimer in the documentation
 *   and/or other materials provided with the distribution.
 * - Neither the name of Eyescale Software GmbH nor the names of its
 *   contributors may be used to endorse or promote products derived from this
 *   software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef PLYLIB_VERTEXBUFFERDATA_H
#define PLYLIB_VERTEXBUFFERDATA_H

#include "typedefs.h"
#include <fstream>
#include <vector>

namespace triply
{
/** Holds the final kd-tree data, sorted and reindexed.  */
class VertexBufferData
{
public:
    void clear()
    {
        vertices.clear();
        colors.clear();
        normals.clear();
        indices.clear();
    }

    /*  Write the vectors' sizes and contents to the given stream.  */
    void toStream(std::ostream& os)
    {
        writeVector(os, vertices);
        writeVector(os, colors);
        writeVector(os, normals);
        writeVector(os, indices);
    }

    /*  Read the vectors' sizes and contents from the given MMF address.  */
    void fromMemory(char** addr)
    {
        clear();
        readVector(addr, vertices);
        readVector(addr, colors);
        readVector(addr, normals);
        readVector(addr, indices);
    }

    std::vector<Vertex> vertices;
    std::vector<Color> colors;
    std::vector<Normal> normals;
    std::vector<ShortIndex> indices;

private:
    /*  Helper function to write a vector to output stream.  */
    template <class T>
    void writeVector(std::ostream& os, std::vector<T>& v)
    {
        size_t length = v.size();
        os.write(reinterpret_cast<char*>(&length), sizeof(size_t));
        if (length > 0)
            os.write(reinterpret_cast<char*>(&v[0]), length * sizeof(T));
    }

    /*  Helper function to read a vector from the MMF address.  */
    template <class T>
    void readVector(char** addr, std::vector<T>& v)
    {
        size_t length;
        memRead(reinterpret_cast<char*>(&length), addr, sizeof(size_t));
        if (length > 0)
        {
            v.resize(length);
            memRead(reinterpret_cast<char*>(&v[0]), addr, length * sizeof(T));
        }
    }
};
}

#endif // PLYLIB_VERTEXBUFFERDATA_H
